.\" Copyright (C) 2004, 2005, 2007, 2014-2016 Internet Systems Consortium, Inc. ("ISC")
.\" Copyright (C) 2000, 2001 Internet Software Consortium.
.\" 
.\" Permission to use, copy, modify, and/or distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\" 
.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
.\" PERFORMANCE OF THIS SOFTWARE.
.\"
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.\"     Title: lwres_getrrsetbyname
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 2007-06-18
.\"    Manual: BIND9
.\"    Source: ISC
.\"  Language: English
.\"
.TH "LWRES_GETRRSETBYNAME" "3" "2007\-06\-18" "ISC" "BIND9"
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.\" * Define some portability stuff
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
lwres_getrrsetbyname, lwres_freerrset \- retrieve DNS records
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <lwres/netdb\&.h>
.fi
.ft
.HP \w'int\ lwres_getrrsetbyname('u
.BI "int lwres_getrrsetbyname(const\ char\ *" "hostname" ", unsigned\ int\ " "rdclass" ", unsigned\ int\ " "rdtype" ", unsigned\ int\ " "flags" ", struct\ rrsetinfo\ **" "res" ");"
.HP \w'void\ lwres_freerrset('u
.BI "void lwres_freerrset(struct\ rrsetinfo\ *" "rrset" ");"
.PP
The following structures are used:
.PP
.nf
struct  rdatainfo {
        unsigned int            rdi_length;     /* length of data */
        unsigned char           *rdi_data;      /* record data */
};
.fi
.PP
.nf
struct  rrsetinfo {
        unsigned int            rri_flags;      /* RRSET_VALIDATED\&.\&.\&. */
        unsigned int            rri_rdclass;    /* class number */
        unsigned int            rri_rdtype;     /* RR type number */
        unsigned int            rri_ttl;        /* time to live */
        unsigned int            rri_nrdatas;    /* size of rdatas array */
        unsigned int            rri_nsigs;      /* size of sigs array */
        char                    *rri_name;      /* canonical name */
        struct rdatainfo        *rri_rdatas;    /* individual records */
        struct rdatainfo        *rri_sigs;      /* individual signatures */
};
.fi
.sp
.SH "DESCRIPTION"
.PP
\fBlwres_getrrsetbyname()\fR
gets a set of resource records associated with a
\fIhostname\fR,
\fIclass\fR, and
\fItype\fR\&.
\fIhostname\fR
is a pointer a to null\-terminated string\&. The
\fIflags\fR
field is currently unused and must be zero\&.
.PP
After a successful call to
\fBlwres_getrrsetbyname()\fR,
\fI*res\fR
is a pointer to an
\fBrrsetinfo\fR
structure, containing a list of one or more
\fBrdatainfo\fR
structures containing resource records and potentially another list of
\fBrdatainfo\fR
structures containing SIG resource records associated with those records\&. The members
\fBrri_rdclass\fR
and
\fBrri_rdtype\fR
are copied from the parameters\&.
\fBrri_ttl\fR
and
\fBrri_name\fR
are properties of the obtained rrset\&. The resource records contained in
\fBrri_rdatas\fR
and
\fBrri_sigs\fR
are in uncompressed DNS wire format\&. Properties of the rdataset are represented in the
\fBrri_flags\fR
bitfield\&. If the RRSET_VALIDATED bit is set, the data has been DNSSEC validated and the signatures verified\&.
.PP
All of the information returned by
\fBlwres_getrrsetbyname()\fR
is dynamically allocated: the
\fBrrsetinfo\fR
and
\fBrdatainfo\fR
structures, and the canonical host name strings pointed to by the
\fBrrsetinfo\fRstructure\&. Memory allocated for the dynamically allocated structures created by a successful call to
\fBlwres_getrrsetbyname()\fR
is released by
\fBlwres_freerrset()\fR\&.
\fIrrset\fR
is a pointer to a
\fBstruct rrset\fR
created by a call to
\fBlwres_getrrsetbyname()\fR\&.
.PP
.SH "RETURN VALUES"
.PP
\fBlwres_getrrsetbyname()\fR
returns zero on success, and one of the following error codes if an error occurred:
.PP
\fBERRSET_NONAME\fR
.RS 4
the name does not exist
.RE
.PP
\fBERRSET_NODATA\fR
.RS 4
the name exists, but does not have data of the desired type
.RE
.PP
\fBERRSET_NOMEMORY\fR
.RS 4
memory could not be allocated
.RE
.PP
\fBERRSET_INVAL\fR
.RS 4
a parameter is invalid
.RE
.PP
\fBERRSET_FAIL\fR
.RS 4
other failure
.RE
.PP
.RS 4
.RE
.SH "SEE ALSO"
.PP
\fBlwres\fR(3)\&.
.SH "AUTHOR"
.PP
\fBInternet Systems Consortium, Inc\&.\fR
.SH "COPYRIGHT"
.br
Copyright \(co 2004, 2005, 2007, 2014-2016 Internet Systems Consortium, Inc. ("ISC")
.br
Copyright \(co 2000, 2001 Internet Software Consortium.
.br
